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Parameter estimation of thrust models of uninhabited airborne systems

Parameter estimation of thrust models of uninhabited airborn...

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作者： Perez, Tristan De Lamberterie, Pierre Donaire, Alejandro Herrero, Elias Revestido School of Engineering Discipline of Mechanics and Mechatronics University of Newcastle Callaghan NSW 2308 Australia University of Newcastle Callaghan NSW 2308 Australia Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

ISBN: (纸本)9783902661876

This paper presents a method for the estimation of thrust model parameters of uninhabited airborne systems using specific flight tests. Particular tests are proposed to simplify the estimation. The proposed estimation method is based on three steps. The first step uses a regression model in which the thrust is assumed constant. This allows us to obtain biased initial estimates of the aerodynamic coefficients of the surge model. In the second step, a robust nonlinear state estimator is implemented using the initial parameter estimates, and the model is augmented by considering the thrust as random walk. In the third step, the estimate of the thrust obtained by the observer is used to fit a polynomial model in terms of the propeller advanced ratio. We consider a numerical example based on Monte-Carlo simulations to quantify the sampling properties of the proposed estimator given realistic flight conditions.

关键词： Parameter estimation

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Optimized fractional order conditional integrator

Optimized fractional order conditional integrator

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作者： Luo, Ying Chen, YangQuan Pi, Youguo Monje, Concepción A. Vinagre, Blas M. Dept. of Automation Science and Engineering South China University of Technology Guangzhou China Dept. of Electrical and Computer Engineering Utah State University Logan UT United States Dept. of System Engineering and Automatics Higher Technical School University Carlos III of Madrid Madrid Spain Dept. of Electrical Electronic and Automatic Engineering Industrial Engineering School University of Extremadura Spain

ISBN: (纸本)9781424474264

In this paper, an optimized fractional order conditional integrator (OFOCI) is proposed. The key feature of this OFOCI is that, the fractional order α and the parameter κ for the "hold" value in the course of integration can be tuned following the analytical optimality design specifications, to achieve the optimized performance not achievable using integer order conditional integrators. The proposed optimality specifications are given to satisfy the desired phase delay, and minimize the preferred magnitude ratio, which can be calculated from the high order harmonic magnitudes divided by the magnitude of the fundamental wave. The numerical solution of calculating the optimized parameters α and κ of the OFOCI is introduced. The phase delays and magnitude ratios of four designed OFOCIs are compared with the integer order conditional integrators. Simulation results with the FFT spectra are also presented to validate the theoretical analysis. © 2010 AACC.

关键词： Specifications

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Energy-optimized secure remote fingerprint authentication in a mobile environment

Energy-optimized secure remote fingerprint authentication in...

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2010 International Conference on Consumer Electronics, ICCE 2010

作者： Hong, Seungwoo Lee, Sungju Chung, Yongwha Kim, Hakil Pan, Sungbum Dept. of Computer and Information Science Korea University Korea Republic of Human ID Research Team ETRI Chosun University Korea Republic of Dept. of Information and Communication Engineering Biometrics Engineering Research Center Inha University Korea Republic of Dept. Control Instrumentation and Robot Engineering Chosun University Korea Republic of

ISBN: (纸本)9781424443161

To optimize the energy consumption during transmission in a secure remote fingerprint authentication system, most approaches have considered a fixed-rate compression of WSQ(Wavelet Scalar Quantization). To balance the energy consumption and the recognition accuracy, however, we need to consider the total energy consumption during compression/encryption/transmission and the quality of the given image. In this paper, we first develop an energy-accuracy prediction model. Then, from the given image, we can evaluate the quality of it. Finally, from the user's minimum requirement of the recognition accuracy, the energy-optimized compression rate under the requirement can be derived adaptively. Based on the experimental result, we show that total energy consumption of the fixed approach can be reduced by 29%. ©2010 IEEE.

关键词： Energy utilization

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RETRACTED ARTICLE: Material inner defect detection by a vibration spectrum analysis

RETRACTED ARTICLE: Material inner defect detection by a vibr...

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作者： Krejcar, Ondrej Frischer, Robert Dept. of Measurement and Control Center for Applied Cybernetics Faculty of Electrical Engineering and Computer Science Ostrava Czech Republic Dept. of Automation and Computing in Metallurgy VSB Technical University of Ostrava Ostrava Czech Republic

ISBN: (纸本)9781424474806

In this paper is described possibility of nondestructive diagnostics of solid objects by software analysis of vibration spectrum. With using platform MATLAB, we can process and evaluate information from accelerometer, which is placed on the measured object The analog signal is digitized by special I/O device dSAPCE CP-1104 and then processed offline with FFT (Fast Fourier Transform). The power spectrum is then examined by developed evaluating procedures and individual results are displayed in bar graph. When we take a look on results, there is an evidently correlation between spectrum and examining object (inner defects). © 2010 IEEE.

关键词： Spectrum analysis

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Multi objective optimization for piloting a Quality Management System: Study case

Multi objective optimization for piloting a Quality Manageme...

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2010 International Conference on System Science and engineering, ICSSE 2010

作者： Mahmoud, H. Ben Ketata, R. Romdhane, T. Ben Ahmed, S. Ben Dept. of Physics and Instrwnentation Engineering INSAT: National Institute of Applied Science and Technology Tunis Tunisia Dept. of Physics and Instrwnentation Engineering ICOS: Research Unit on Intelligent Control Design and Optimization of Complex System Tunis Tunisia Dept. of Physics and Instrumentation Engineering MOSIC Research Unit on Methods and Tools for Complex Computer Systems Tunis Tunisia

ISBN: (纸本)9781424464746

This paper presents a decision support tool for the effectiveness of a Quality Management System (QMS) in a company. To develop this tool, a new approach PAHP based on the combination of the Pareto Optimality Concept (Poq and the Analytical Hierarchy Process (AHP). This approach is used to model and optimize the multi-objective function of real company which presents a major problem for controlling the quality level of production. © 2010 IEEE.

关键词： Multiobjective optimization

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Ride through of OWC-based wave power generation plant with air flow control under symmetrical voltage dips

Ride through of OWC-based wave power generation plant with a...

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Mediterranean Conference on control and Automation (MED)

作者： M. Alberdi M. Amundarain AJ. Garrido I. Garrido Department Automatic Control and Systems Engineering University of Basque Country (UPV-EHU) Bilbao Spain Dept. Automatic Control and Systems Engineering University of the Basque Country Bilbao SPAIN

The suitability of distributed power generation systems working at medium and high capacity as it is the case of wave power generation plants, requires a reliable Fault-Ride-Through capability. When a grid fault occurs on the transmission system, the speed of the turbo-generator group increases uncontrolled, the induction generator injects large peak currents that can potentially damage the rotor converters and the plant tends to increase the reactive power consumption, so that it might intensify the voltage dip and contribute to the collapse of the power network. A simple solution would be the automatic disconnection of the plant from the grid in response to the power fault, but this policy could lead to a series of chain disconnections that would produce a massive power network failure. This is why new Grid Codes oblige the distributed power generation systems to remain connected to the power network, even in case of balanced voltage dips. In this paper, an Oscillating Water Column (OWC)-based wave power generation plant equipped with a Doubly Fed Induction Generator is modeled and controlled to overcome these balanced grid faults. The improvement relays on the implementation of a control scheme that suitably coordinates the air flow control, the crowbar, the rotor and the grid side converters to allow the plant to remain in service during the grid fault, and to contribute to its attenuation by supplying reactive power to the network. The simulated results show how it is obtained a great reduction in the rotor currents, improving the transient power stability and avoiding the rotor acceleration, complying with new Grid Codes requirements.

关键词： Rotors Reactive power Stators Circuit faults Wind turbines Valves

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A method for testing AQM controllers with probability guaranteed properties

A method for testing AQM controllers with probability guaran...

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作者： Maestre, José M. Alvarez, Teresa Salim, Anuar Álamo, Teodoro Department of Engineering Science and Automatic Control School of Industrial Engineering University of Valladolid Valladolid Spain Dept. de Ingeniería de Sistemas y Automática Escuela Superior de Ingenieros University of Seville Spain

ISBN: (纸本)9789881821089

Internet users rely on the good capabilities of TCP/IP networks for dealing with congestion. The network delay and the number of users change constantly, which might lead to transmission problems. Usually, these problems are solved following a data communication approach such as drop tail or random early detection (RED) algorithms. Recently, more involved techniques based on an active queue management (AQM) control system have been proposed. This paper presents a probabilistic methodology to test whether a given AQM feedback controller satisfies a predefined set of requirements when dealing with control congestion under a variety of network configurations with a certain degree of confidence. The proposed technique is demonstrated through simulation in NS-2.

关键词： controllers

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A face based fuzzy vault scheme for secure online authentication

A face based fuzzy vault scheme for secure online authentica...

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2nd International Symposium on Data, Privacy and E-Commerce, ISDPE 2010

作者： Wu, Lifang Yuan, Songlong School of Electronic Information and Control Engineering Beijing University of Technology Beijing 100124 China Dept. of Computer Science and Engineering State University of New York at Buffalo Buffalo NY 14260 United States

ISBN: (纸本)9780769542034

Biometric template protection is becoming a hot research recently. Fuzzy vault is a key binding biometric cryptosystem scheme. It binds a key with the biometric template and obtains the helper data. The main problem of fuzzy vault is that it can not provide the diversity and revocability. In this paper we propose a face based fuzzy vault scheme for online authentication. At the user side, the user's identity, the transformed template and key generated from user's password are always provided to the server. At the registration stage, fuzzy vault encoding is implemented using both key and transformed template. And then the fuzzy vault is encrypted using digital signature. At the authentication stage, by the identity claimed by user, the corresponding fuzzy vault will be checked, If it has been changed, the authentication will be failed. Otherwise, the key is recovered from the transformed template using fuzzy vault decoding, in which the nearest distance is computed for point matching. If the recovered key is same as that provided by user, the authentication will be successful. Otherwise it will be failed. The contribution of this paper include: the transformed template instead of face template is used, which will enable the system to provide diversity and revocability. The nearest distance based matching algorithm tolerates the much intra-class variation. The digital signature can be used to check if the fuzzy vault has been changed. The experimental results show that the proposed scheme achieves promising results. © 2010 IEEE.

关键词： Authentication

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A method of multi-rate single-side networked control for linear time-invariant system with state-feedback

A method of multi-rate single-side networked control for lin...

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International Conference on computer Science & Education (ICCSE)

作者： Liu, Dian-Ting Zhou, De-Jian Liu, Yao-Ming College of Mechanical and Control Engineering Guilin University of Technology Xidian University Guilin China Dept. of Mechanical Engineering Guangxi University of Technology Liuzhou China Dept. of Computer Science Guilin University of Technology Liuzhou China College of Information Science and Engineering Guilin University of Technology Guilin China

ISBN: (纸本)9781424460052

A kind of MIMO networked control systems, in which the sensors and controller are interconnected by network and the state of control object is feedback to the controller and each loop is controlled at different sampling period, is studied in this paper. Supposed that the maximum network-induced delay is smaller than one sample period, its model is established. Based on estimation theorem of feature value from perturbation theory, the maximum allowable delay bounds subject to asymptotic stability for systems is derived. Simulation example shows that the stability criterion is feasible. ©2010 IEEE.

关键词： controllers

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Mutual Temporal Data store approach based on C-TRDM

Mutual Temporal Data store approach based on C-TRDM

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2010 2nd IEEE International Conference on Information Management and engineering, ICIME 2010

作者： Cai, Qixian Cai, Hongbo Huang, Xiaolu Pei, Feng Dept. of Computer Engineering Guangxi University of Technology Liuzhou 545006 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China School of Information Engineering University of Science and Technology Beijing Beijing 100083 China Dept. of Electronic Information and Control Engineering Guangxi University of Technology Liuzhou 545006 China

ISBN: (纸本)9781424452644

Based on the temporal relation data model C-TRDM[1], it puts forward a concept of Mutual Temporal Data in datatable with common Timeline and defines Temporal Data Stack to store Mutual Temporal Data. The Temporal Data Stack is compatible with the traditional data operation and is easy to save and compress temporal data, which is the foundation of the unitive mutual data platform. In addition, it can improve B+ trees index performance and use associative memory to adapt for the fast search of high dept. Temporal Data Stack. © 2010 IEEE.

关键词： Trees (mathematics)

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